Pin error
Series linear regulated power supply is cheaper than switching power supply, but the power conversion efficiency is low. Typically, many engineers choose to use linear regulated power supplies due to their ease of use and affordability. But it needs to be noted that although it is convenient to use, it will consume a lot of power and cause a lot of heat dissipation. In contrast, switching power supplies are complex in design, but more efficient. However, it should be noted that the output pins of some regulated power supplies may be incompatible with each other, so you need to confirm the relevant pin definitions in the chip manual before wiring.

Wiring error
The comparative discrepancies between design and layout are the main mistakes that cause the final stage of PCB design. So some things need to be double-checked, such as device size, via quality, pad size, and review level. In short, repeated validation checks against the design schematic are required.